Ever wondered why forests are called the 'lungs of the Earth'?

Uniting people to protect the planet.

Revisit the highlights

From icy Antarctica to the International Space Station, WWF's Earth Hour swept around the globe on Saturday 28 March 2015 (8:30 p.m. local time). Millions of Earth Hour supporters worldwide joined forces to highlight the need for climate action. Revisit the highlights and energy the movement generated across the world!

Watch our impact video

In 2015, WWF’s Earth Hour grew to become the world’s largest grassroots movement for the environment. While the global lights out remains an impactful visual call-out, its true impact is starting to be seen in areas and communities fighting climate change on an everyday basis.